PHILADELPHIA — Several Eagles trotted into the locker room after finishing Saturday’s training camp practice, while others chatted and a few receivers and defensive backs went to catch passes from the Jugs machine. But two players — one of the team’s oldest and one of its youngest — separated from those groups.

On the far field, nine-time Pro Bowl offensive tackle Jason Peters stood in front of first-round rookie defensive end Derek Barnett. The two talked and then bent down in their starting positions as a blocker and pass rusher, respectively, allowing the 21-year-old Barnett an opportunity to try to make a move past the 35-year-old Peters.

Then they did it again. And talked some more. And repeated the process a few times before walking off the field.

Peters has developed into a vital resource for Barnett, the 14th overall pick in April’s draft, as he aims to make a quick transition to the NFL game.

“He just can tell me what I can work on more,” Barnett said. “He’s seen me rush, and he’s seen a lot of guys rush. He’s been in the league 14 years. He’s going to be a Hall of Famer, so every time I get the chance to talk to him, I’m going to.”

Barnett said part of the reason he was clamoring to stay to practice against Peters on Saturday was that he had a “sh—y” practice. He thought his technique was sloppy during team drills and want to shore thing up before heading into the locker room for post-practice treatment.

Even on good days, though, Barnett realizes that he has steep obstacles to overcome if he wants to shine in his first season with Philadelphia. As defensive coordinator Jim Schwartz put it this…